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In C4 chloroplasts CO2 is fixed by Rubis...

In `C_4` chloroplasts `CO_2` is fixed by Rubisco/PEP carboxylase.

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### Step-by-Step Solution: 1. **Understanding the Question**: The question asks which enzyme is responsible for fixing carbon dioxide in C4 chloroplasts. 2. **Identifying Key Enzymes**: There are two enzymes mentioned: Rubisco and PEP carboxylase. Rubisco (Ribulose-1,5-bisphosphate carboxylase/oxygenase) is primarily associated with C3 photosynthesis, while PEP carboxylase (phosphoenolpyruvate carboxylase) is associated with C4 photosynthesis. 3. **Role of Rubisco**: Rubisco is an enzyme that catalyzes the first major step of carbon fixation in the Calvin cycle, which occurs in C3 plants. It fixes carbon dioxide to ribulose bisphosphate (RuBP). ...
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Crassulacean acid metabolism I. is an alternative of the C_3 and C_4 - pathway of CO_2 fixation found in plants living in dry hot climate. II. Pathway resemble C_4 - pathway in that CO_2 is trapped by highly efficient PEP- carboxylase. III. is a special type of respiration show by many green plants, when why they are exposed to light. IV. is catalysed by the enzyme serine hydroxymethyl transferase.

In C_(4) plants, chloroplasts are also found in

Assertion: Due to pollution atmospheric concentration of CO_(2) is increasing which will be harmful for C_(4) plants whee as productive for C_(4) . plants. Reasons : C,_(4) plants have greater efficiency for CO_(2) as CO_(2) is fixed by PEP oxygenase.

In C_(4) plants, RuBisCO is present in

A : Tropical plants are more efficient in CO_(2) untilization. R : C_(4) plants ensure that RuBisCO functions as carboxylase minimising oxygenase acitivity.

RuBisCO content of chloroplast is

RuBP carboxylase is a less efficent enzyme for CO_(2) fixation in photosynthesis than PEP carboxylase because:

Assertion : The primary CO_(2) acceptor in C_(4) pathway is 3-carbon molecule phosphoenol pyruvate (PEP). Reason: The enzyme responsible for this fixation is PEP carboxylase or PEPcase.